Pneumatic pitman-balance for swing-jaw rock and ore crushers.



F. M. WEBBER.

PNEUMATIC PITMAN BALANCE FOR SWING JAW ROCK AND ORE CRUSHERS.

APPLICATION FILED AuG.9. i916.

1,226,832. Patented May 22, 1917.

2 SHEETS-SHET I.

[NTOR Fkaz: M. WEBBER F. M; WEBBER. PNEUMATIC PITMAN BALANCE FOR SWiNG JAW ROCK AND ORE CRUSHERS.

APPLICATION FILED AUG-9.1916.

1,226,882 Patented May 22, 1917.

2 SHEETSSHEET 2- FIG. 2.

[NIZYVTOR FRED M EBBER, or JOPLIN, ivrrssounr.

Specification of Letters Patent.

Patented May 22, 1917.

Application filed August 9, 1916. Serial No. 113,886.

'10 all whom it may concern:

Be it known that I, FRED M. WEBBER, a citizen of the United States, and a resident of Joplin, in the State of Missouri, have lnvented certain new and useful Improvements in Pneumatic Pitman-Balances for Swing-J aw Rock and Ore Crushers, of which the following is a specification containing a full,]clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to an improved means for balancing the great weight of pitmen, in the larger sizes of swing-j aw stone and ore crushers, and it consists in the novel construction and arrangement of parts hereinafter described, and specially designated in the claims found at the end of this specification.

Heretofore, in swing-jaw crushersof the larger sizes, wherein the pitmen weigh several tons, the eficiency of the crushers has been greatly depreciated, and much expense for repairs has been necessitated by the great weight of the pitmen resting upon the j ournals of the main shafts, and wearing them and their boxes out to an excessive degree.

The object of my invention is to provide an improved pneumatic balance for the weight of the pitmen, and thereby prevent excessive wear on said parts.

In the drawings:

Figure 1 is an end elevation, partly in section, of a swing-jaw stone or ore crusher, having my invention applied thereto, and

Fig. 2 is a side elevation of the same, partly in section, enlarged, and with parts broken away.

The numeral 1 designates the fixed jaw of the crusher, which is of the usual common construction and attached to the usual end plates 2 of the frame, while 3 indicates the swing-j aw supported by its shaft 4, to swingin the usual manner between said end plates, in crushing the stone or ore that is fed between said fixed and swing jaws.

The said swing-jaw 3 is vibrated by the toggle-arms 5 and the pitman 6, in the usual manner, whenever the main or crank shaft 7 is rotated by any suitable power.

The said main shaft 7 is mounted in the usual boxes 8.

In the present instance, I mount upon the cap 9 of the main shaft boxes a pneumaticchamber in the form of a cylinder 10, which is secured to said caps by means of screws 11 passed through the base flanges 12 of said cylinder into the said cap of said main shaft boxes 8.

These pneumatic cylinders are for the purpose of taking the weight of the said pitman 6 off of the said main shaft, and while I have here shown two of such cylinders mounted as above described, I do not confine myself to two cylinders, as it is obvious that on smaller crushers the pitman may be balanced by one cylinder only.

Mounted telescopically upon the exterior of said cylinders are the inverted cylinders 13, which are connected by a supportingbeam 1 1, resting upon the closed upper ends of said inverted cylinders, and sustaining the weight of the pitman 6 by means of links 15 having their upper ends mounted between perforated cars 16 depending from the underside of said beam and secured to said ears by bolts 17, and having their lower ends secured to said pitman by perforated cars 18 formed on the upper half of the pitman box, and bolts 19 passing through said ears and through bearings 20 in the lower ends of said links.

A tight joint is maintained between the exterior of said cylinders 10 and the bore of said inverted cylinders by means of common packing 21, glands 22 and bolts 23.

An annular oil chamber 24 is formed in the walls of said inverted cylinders at a point above said packing, to keep the same thoroughly lubricated, and said oil chamber is supplied with oil through the openings 25 by removing the threaded plugs 26.

The upper ends of said cylinders 10 are open, topermit the air to pass freely from the interior of said cylinders to the interior of the said inverted cylinders 13, during operation of the machine.

As a double precaution against possible leakage of air from the said cylinders 10 and 13, I provide a common cup-leather 27 at the upper end of said cylinders 10, secured thereat by bolts 28 passed through a flange 29 on which said cup-leather rests, through said cup-leather, and into a cylindrical follower 30, which latter rests upon said cup-leather, to firmly bind said cupleather in position.

A11 additional oil-chamber 31 is formed between the upstanding walls of said follower 30 and the adjacent wall of said inverted cylinder 13, and oil is supplied to such chamber by way of openings similar of said swing-jaw 3, and having a compressed-air connection 3% for supplying air to said cylinder, and thereby retaining the proper yieldingpressure upon said jaw, to urge the same toward said toggle arms 5 at all times, and prevent said arms from falling out-of position when said jaw is being operated by said pitman.

The operation.

The operation of my invention is as fol-' lows:

A continuous pressure of air is to be maintained within said cylinders 10 and 13 during operation of the crusher, and the same acts as a pneumatic balance for the weight of the said pitman, by supporting it and taking it oif of the main shaft, with the resultant economy of upkeep heretofore men tioned.

Compressed air may be supplied to the said cylinders byway of a suitable'pipe 35,

especially provided for the purpose.

A common check-valve 36 is located in said pipe 35, to prevent escape of the air from said cylinders.

I claim the following:

1. The combination with the pitman of a stone or pre crusher, of an air-cylinder, movable part connected to said cylinder, and a connection between said movable part and said pitman,rto support the weight of the latter during its movements.

2. The combination with the pitman of a stone or ore crusher, of a beam supported above said pitman, and an air-cushion connected to said pitman and to said beam, to support the weight of the pitman during movement of the latter.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

FRED M. WEBBER.

Witnesses:

HENRY L. HIGDON, JOHN C. Brown.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

